Fix docs and dns servers placement order

- Update docs and a drawing to clarify DNS setup.
- Change order of nameservers placement to match
  changes in https://github.com/kubespray/kargo/pull/501

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

roles/dnsmasq/tasks/resolvconf.yml

@@ -22,7 +22,7 @@
 - name: generate nameservers to resolvconf
   set_fact:
     nameserverentries:
-      "{{ nameservers|default([]) + dnsmasq_server|default([]) }}"
+      "{{ dnsmasq_server|default([]) + nameservers|default([]) }}"
 
 - name: Remove search and nameserver options from resolvconf head
   lineinfile:
@@ -37,7 +37,7 @@
   when: resolvconf.rc == 0
   notify: Dnsmasq | update resolvconf
 
-- name: Add search resolv.conf
+- name: Add search domains to resolv.conf
   lineinfile:
     line: "search {{searchentries}}"
     dest: "{{resolvconffile}}"
@@ -47,7 +47,7 @@
     follow: yes
   notify: Dnsmasq | update resolvconf
 
-- name: Add local dnsmasq to resolv.conf
+- name: Add nameservers to resolv.conf
   blockinfile:
     dest: "{{resolvconffile}}"
     block: |-